Article 918 of the French Civil Code
The value of the full ownership of the property alienated, either on payment of a life annuity, or on a non-refundable basis, or with reservation of usufruct to one of the successors in the direct line, is deducted from the available portion. Any excess is subject to reduction. This deduction and reduction may only be requested by those of the other successors in the direct line who have not consented…